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    <title>Document</title>
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    <script>
        // let bool = Number.isFinite(Math.PI);
        // console.log(bool);

        // let bool = Number.isNaN(123);
        // console.log(bool);

        // 判断是否为整数
        // let bool = Number.isInteger(123.12);
        // console.log(bool);

        // 取整
        // let n1 = Number.parseInt(123.12);
        // console.log(n1);

    </script>
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